Jtekt Corporation

Takayasu Yamazaki

Shirou Nakano

Shigeki Nagase

Takeshi Ueda

Katsutoshi Nishizaki

Masahiko Sakamaki

Toshiaki Oya

Ken Matsubara

Yoshikazu Kuroumaru

Yasuhiro Saitou

Yasuhiro Kamatani

Hironori Yamato

Youjirou Kakoki

Takeshi c/o Jtekt Corporation Ueda

Yasuhiro c/o Jtekt Corporation Saitou

A rack-and-pinion steering apparatus comprises pinion teeth formed according to proper tooth specifications in other aspects under a larger pressure angle, thereby stably offering smooth and comfortable steering feeling over a long time. The module (m), number of teeth (z), tooth depth (h) and helix angle (&#x3b2;) of the pinion teeth () are set within the following ranges, under a pressure angle (&#x3b1;) set within a range of 24&#xb0; to 30&#xb0; and a given stroke ratio.

Rack-and-pinion steering apparatus

A rack and pinion steering apparatus which does not need quenching of the rack shaft after gear cutting of the rack shaft in manufacturing processes is provided. The rack and pinion steering apparatus comprises a pinion shaft and a rack shaft meshing with the pinion shaft. The rack shaft is formed to have a substantially uniform hardness.

Rack and pinion steering apparatus and method of manufacturing rack shaft

An electric power steering system is provided which is capable of providing a favorable steering feeling without using compensation logics such as of inertia compensation and friction compensation. The electric power steering system includes road-noise suppression control means () for controlling a steering assist motor () in a manner to damp torque transmission in a higher frequency region representing road noises than a frequency region representing road information. A friction value of a steering mechanism (A) is decreased enough to allow the intrinsic vibrations of the steering mechanism (A) to appear. Rotor inertia of the steering assist motor () is set to a value small enough to allow the frequencies of the intrinsic vibrations to be present in the frequency region where the torque transmission is damped by the road-noise suppression control means ().

Electric power steering system

The present invention provides a rack-and-pinion steering apparatus capable of effectively reducing reverse input, while a high degree of design freedom is secured. The sum of the tilt angle of a rack tooth with respect to a reference line perpendicular to the axial line of a rack shaft and the tilt angle of a pinion tooth with respect to the axial line of a pinion shaft does not coincide with the tilt angle of the axial line of the pinion shaft with respect to the reference line. Crowning is given on the tooth surface of the rack tooth (or the pinion tooth) in order to decrease the tooth width on one end side in the direction of tooth trace and to increase the tooth width on the other end side according to the state of contact with the pinion tooth (or the rack tooth) opposed thereto.

Growing community of inventors

Kyoto, Japan

Takayasu Yamazaki